After early developer access details were "publicly circulated", the Unichain team has disabled its public RPC. However, since some users have transferred funds to Unichain through related contracts, these user funds are temporarily unable to be transferred out. (The Block)
Previously, Unichain issued a statement saying that some details about early developer access to the Unichain mainnet have been publicly circulated, but the Unichain mainnet has not yet been launched - and the specification of the cross-chain bridge has not yet been finalized.